Chain Transfer Activity of ω-Unsaturated Methacrylic Oligomers in Polymerizations of Methacrylic Monomers

2004 ◽  
Vol 37 (12) ◽  
pp. 4441-4452 ◽  
Author(s):  
Lillian Hutson ◽  
Julia Krstina ◽  
Catherine L. Moad ◽  
Graeme Moad ◽  
Gregory R. Morrow ◽  
...  
Keyword(s):  
Chain Transfer ◽  
Transfer Activity ◽  
Methacrylic Monomers

Incorporation of Antioxidant Groups into Polydienes. I. Via Chain Transfer Reactions of Symmetrical Dithiodiphenols

1977 ◽  
Vol 50 (4) ◽  
pp. 641-649 ◽  
Author(s):  
A. H. Weinstein
Keyword(s):  
Chain Transfer ◽  
Chain Transfer Agent ◽  
Transfer Reactions ◽  
Oxygen Absorption ◽  
Transfer Activity ◽  
Transfer Agents

Abstract A number of substituted symmetrical dithiodiphenols and related monothio-and trithiodiphenols were prepared and characterized. Some of these dithiodiphenols showed chain transfer activity either in bulk styrene or in emulsion diene polymerizations. The fact that phenolic sulfide units were incorporated into polyisoprene and polybutadiene by use of one of these compounds, 2,2′-dithiobis(6-t-butyl-p-cresol), as chain transfer agent was confirmed by ultraviolet analysis. It was demonstrated that selfresistance to oxidation was incorporated into various diene homo- or copolymers, to varying degree, by use of some of these dithiodiphenols as chain transfer agents, on the basis of oxygen absorption tests on preextracted polymers.

scholarly journals Metal Ion-dependent Heavy Chain Transfer Activity of TSG-6 Mediates Assembly of the Cumulus-Oocyte Matrix

2015 ◽  
Vol 290 (48) ◽  
pp. 28708-28723 ◽  
Author(s):  
David C. Briggs ◽  
Holly L. Birchenough ◽  
Tariq Ali ◽  
Marilyn S. Rugg ◽  
Jon P. Waltho ◽  
...  
Keyword(s):  
Heavy Chain ◽  
Metal Ion ◽  
Chain Transfer ◽  
Transfer Activity

scholarly journals Prooxidative chain transfer activity by thiol groups in biological systems

Redox Biology ◽  
2020 ◽  
Vol 36 ◽  
pp. 101628 ◽  
Author(s):  
Sascha Kunath ◽  
Mario Schindeldecker ◽  
Antonio De Giacomo ◽  
Theresa Meyer ◽  
Selina Sohre ◽  
...  
Keyword(s):  
Chain Transfer ◽  
Biological Systems ◽  
Thiol Groups ◽  
Transfer Activity

Chain Transfer Activity of ω-Unsaturated Methyl Methacrylate Oligomers

1996 ◽  
Vol 29 (24) ◽  
pp. 7717-7726 ◽  
Author(s):  
Catherine L. Moad ◽  
Graeme Moad ◽  
Ezio Rizzardo ◽  
San H. Thang
Keyword(s):  
Methyl Methacrylate ◽  
Chain Transfer ◽  
Transfer Activity

Chain transfer activity of some activated allylic compounds

1990 ◽  
Vol 24 (5) ◽  
pp. 501-505 ◽  
Author(s):  
Gordon F. Meijs ◽  
Ezio Rizzardo ◽  
San H. Thang
Keyword(s):  
Chain Transfer ◽  
Transfer Activity

scholarly journals Controlled (Co)Polymerization of Methacrylates Using a Novel Symmetrical Trithiocarbonate RAFT Agent Bearing Diphenylmethyl Groups

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4618
Author(s):  
Alvaro Leonel Robles Grana ◽  
Hortensia Maldonado-Textle ◽  
José Román Torres-Lubián ◽  
Claude St Thomas ◽  
Ramón Díaz de León ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Chain Transfer ◽  
Polymerization Process ◽  
Polymerization Reaction ◽  
Molecular Weights ◽  
Molar Ratios ◽  
Efficient Control ◽  
Raft Agent ◽  
Methacrylic Monomers ◽  
Leaving Groups

Herein, we report a novel type of symmetrical trithiocarbonate chain transfer agent (CTA) based diphenylmethyl as R groups. The utilization of this CTA in the Reversible Addition-Fragmentation chain Transfer (RAFT) process reveals an efficient control in the polymerization of methacrylic monomers and the preparation of block copolymers. The latter are obtained by the (co)polymerization of styrene or butyl acrylate using a functionalized macro-CTA polymethyl methacrylate (PMMA) previously synthesized. Data show low molecular weight dispersity values (Đ < 1.5) particularly in the polymerization of methacrylic monomers. Considering a typical RAFT mechanism, the leaving groups (R) from the fragmentation of CTA should be able to re-initiate the polymerization (formation of growth chains) allowing an efficient control of the process. Nevertheless, in the case of the polymerization of MMA in the presence of this symmetrical CTA, the polymerization process displays an atypical behavior that requires high [initiator]/[CTA] molar ratios for accessing predictable molecular weights without affecting the Đ. Some evidence suggests that this does not completely behave as a common RAFT agent as it is not completely consumed during the polymerization reaction, and it needs atypical high molar ratios [initiator]/[CTA] to be closer to the predicted molecular weight without affecting the Đ. This work demonstrates that MMA and other methacrylic monomers can be polymerized in a controlled way, and with “living” characteristics, using certain symmetrical trithiocarbonates.

SYNTHESIS OF METHACRYLIC MONOMERS FROM METHACRYLONITRILE AND POLYMERS ON THEIR BASIS

2020 ◽  
pp. 50-55
Author(s):  
E.S. Mammadova ◽  
◽  
Z.Ch. Salayeva ◽  
N.A. Zeynalov ◽  
G.A. Mammadaliyev ◽  
...  
Keyword(s):  
Methacrylic Monomers

Synthesis and polymerization of new styrylquinoline containing methacrylic monomers

2016 ◽  
Vol 2 (4) ◽  
pp. 48-50 ◽  
Author(s):  
O.G. Kharchenko ◽  
V.O. Smokal ◽  
O.M. Krupka ◽  
A.Yu. Kolendo
Keyword(s):  
Methacrylic Monomers
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